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Connection Pool reset, due to connection parameters change, during operation #66

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a77cb94
Reset db connection on message reception, if needed (new config data)
Mar 3, 2024
4330fcd
Move back connection pool object into configuration node
Mar 3, 2024
c1d192f
Fix linter findings
Mar 4, 2024
3125035
Simplify changes check (don't need full objects comparison)
Mar 4, 2024
f817ebe
Monitor changes to flagged parameters, only; support "reconnect in msg
Mar 7, 2024
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6 changes: 6 additions & 0 deletions locales/en-US/postgresql.json
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -3,11 +3,17 @@
"label": {
"name": "Name",
"host": "Host",
"hostWatch": "Watch host changes",
"port": "Port",
"portWatch": "Watch port changes",
"database": "Database",
"databaseWatch": "Watch database changes",
"ssl": "SSL",
"sslWatch": "Watch SSL changes",
"user": "User",
"userWatch": "Watch user changes",
"password": "Password",
"passwordWatch": "Watch password changes",
"applicationName": "Application name",
"max": "Maximum size",
"idle": "Idle Timeout",
Expand Down
88 changes: 80 additions & 8 deletions postgresql.html
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Original file line number Diff line number Diff line change
Expand Up @@ -20,12 +20,30 @@
<input type="hidden" id="node-config-input-hostFieldType" />
</div>
<div class="form-row">
<label for="node-config-input-port">
<span data-i18n="postgresql.label.port"></span>
</label>
<input type="text" id="node-config-input-port" data-i18n="[placeholder]postgresql.placeholder.port" style="width: 80%;" />
<input type="hidden" id="node-config-input-portFieldType" />
</div>
<label for="node-config-input-hostWatch">
<span ""></span>
</label>
<input type="checkbox" id="node-config-input-hostWatch" style="display: inline-block; width: auto; vertical-align: top;" />
<label for="node-config-input-hostWatch" style="width: auto;">
<span data-i18n="postgresql.label.hostWatch"></span>
</label>
</div>
<div class="form-row">
<label for="node-config-input-port">
<span data-i18n="postgresql.label.port"></span>
</label>
<input type="text" id="node-config-input-port" data-i18n="[placeholder]postgresql.placeholder.port" style="width: 80%;" />
<input type="hidden" id="node-config-input-portFieldType" />
</div>
<div class="form-row">
<label for="node-config-input-portWatch">
<span ""></span>
</label>
<input type="checkbox" id="node-config-input-portWatch" style="display: inline-block; width: auto; vertical-align: top;" />
<label for="node-config-input-portWatch" style="width: auto;">
<span data-i18n="postgresql.label.portWatch"></span>
</label>
</div>
<div class="form-row">
<label for="node-config-input-database">
<i class="fa fa-database"></i>
Expand All @@ -35,12 +53,30 @@
<input type="hidden" id="node-config-input-databaseFieldType" />
</div>
<div class="form-row">
<label for="node-config-input-ssl" style="width: auto;margin-right: 72px;">
<label for="node-config-input-databaseWatch">
<span ""></span>
</label>
<input type="checkbox" id="node-config-input-databaseWatch" style="display: inline-block; width: auto; vertical-align: top;" />
<label for="node-config-input-databaseWatch" style="width: auto;">
<span data-i18n="postgresql.label.databaseWatch"></span>
</label>
</div>
<div class="form-row">
<label for="node-config-input-ssl">
<span data-i18n="postgresql.label.ssl"></span>
</label>
<input type="text" id="node-config-input-ssl" style="display: inline-block; width: auto; vertical-align: top;" />
<input type="text" id="node-config-input-ssl" data-i18n="[placeholder]postgresql.placeholder.ssl" style="width: 80%;" />
<input type="hidden" id="node-config-input-sslFieldType" />
</div>
<div class="form-row">
<label for="node-config-input-sslWatch">
<span ""></span>
</label>
<input type="checkbox" id="node-config-input-sslWatch" style="display: inline-block; width: auto; vertical-align: top;" />
<label for="node-config-input-sslWatch" style="width: auto;">
<span data-i18n="postgresql.label.sslWatch"></span>
</label>
</div>
</div>
<div id="postgresql-config-tab-security" style="display: none;">
<div class="form-row">
Expand All @@ -51,6 +87,15 @@
<input type="text" id="node-config-input-user" data-i18n="[placeholder]postgresql.placeholder.user" style="width: 80%;" />
<input type="hidden" id="node-config-input-userFieldType" />
</div>
<div class="form-row">
<label for="node-config-input-userWatch">
<span ""></span>
</label>
<input type="checkbox" id="node-config-input-userWatch" style="display: inline-block; width: auto; vertical-align: top;" />
<label for="node-config-input-userWatch" style="width: auto;">
<span data-i18n="postgresql.label.userWatch"></span>
</label>
</div>
<div class="form-row">
<label for="node-config-input-password">
<i class="fa fa-lock"></i>
Expand All @@ -59,6 +104,15 @@
<input type="password" id="node-config-input-password" data-i18n="[placeholder]postgresql.placeholder.password" style="width: 80%;" />
<input type="hidden" id="node-config-input-passwordFieldType" />
</div>
<div class="form-row">
<label for="node-config-input-passwordWatch">
<span ""></span>
</label>
<input type="checkbox" id="node-config-input-passwordWatch" style="display: inline-block; width: auto; vertical-align: top;" />
<label for="node-config-input-passwordWatch" style="width: auto;">
<span data-i18n="postgresql.label.passwordWatch"></span>
</label>
</div>
</div>
<div id="postgresql-config-tab-pool" style="display: none;">
<div class="form-row">
Expand Down Expand Up @@ -111,24 +165,36 @@
hostFieldType: {
value: 'str',
},
hostWatch: {
value: false,
},
port: {
value: 5432,
},
portFieldType: {
value: 'num',
},
portWatch: {
value: false,
},
database: {
value: 'postgres',
},
databaseFieldType: {
value: 'str',
},
databaseWatch: {
value: false,
},
ssl: {
value: false,
},
sslFieldType: {
value: 'bool',
},
sslWatch: {
value: false,
},
applicationName: {
value: '',
},
Expand Down Expand Up @@ -159,13 +225,19 @@
userFieldType: {
value: 'str',
},
userWatch: {
value: false,
},
password: {
value: '',
},
passwordFieldType: {
// TODO: https://nodered.org/docs/creating-nodes/credentials
value: 'str',
},
passwordWatch: {
value: false,
},
},
label: function () {
return this.name || this.user + '@' + this.host + ':' + this.port + '/' + this.database;
Expand Down
95 changes: 82 additions & 13 deletions postgresql.js
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Original file line number Diff line number Diff line change
Expand Up @@ -51,9 +51,63 @@ module.exports = function (RED) {
}
}

function getParam(cnfg, key) {
switch (key) {
case 'host':
return getField(cnfg, cnfg.hostFieldType, cnfg.host);
case 'port':
return getField(cnfg, cnfg.portFieldType, cnfg.port);
case 'database':
return getField(cnfg, cnfg.databaseFieldType, cnfg.database);
case 'ssl':
return getField(cnfg, cnfg.sslFieldType, cnfg.ssl);
case 'user':
return getField(cnfg, cnfg.userFieldType, cnfg.user);
case 'password':
return getField(cnfg, cnfg.passwordFieldType, cnfg.password);
case 'appname':
return getField(cnfg, cnfg.applicationNameType, cnfg.applicationName);
case 'max':
return getField(cnfg, cnfg.maxFieldType, cnfg.max);
case 'idle':
return getField(cnfg, cnfg.idleFieldType, cnfg.idle);
case 'timeout':
return getField(cnfg, cnfg.connectionTimeoutFieldType, cnfg.connectionTimeout);
}
return cnfg;
}

function getDbAccessData(cnfg) {
return {
user: getParam(cnfg, 'user'),
password: getParam(cnfg, 'password'),
host: getParam(cnfg, 'host'),
port: getParam(cnfg, 'port'),
database: getParam(cnfg, 'database'),
ssl: getParam(cnfg, 'ssl'),
application_name: getParam(cnfg, 'appname'),
max: getParam(cnfg, 'max'),
idleTimeoutMillis: getParam(cnfg, 'idle'),
connectionTimeoutMillis: getParam(cnfg, 'timeout'),
}
}

function PostgreSQLConfigNode(n) {
const node = this;
RED.nodes.createNode(node, n);

// Build an array of keys of parameters to be watched
const watchFlags = {
host: n.hostWatch,
port: n.portWatch,
database: n.databaseWatch,
ssl: n.sslWatch,
user: n.userWatch,
password: n.passwordWatch,
}
node.watchList = [];
for (const key in watchFlags) { if (watchFlags[key] === true) node.watchList.push(key) };

node.name = n.name;
node.host = n.host;
node.hostFieldType = n.hostFieldType;
Expand All @@ -76,19 +130,11 @@ module.exports = function (RED) {
node.connectionTimeout = n.connectionTimeout;
node.connectionTimeoutFieldType = n.connectionTimeoutFieldType;

this.pgPool = new Pool({
user: getField(node, n.userFieldType, n.user),
password: getField(node, n.passwordFieldType, n.password),
host: getField(node, n.hostFieldType, n.host),
port: getField(node, n.portFieldType, n.port),
database: getField(node, n.databaseFieldType, n.database),
ssl: getField(node, n.sslFieldType, n.ssl),
application_name: getField(node, n.applicationNameType, n.applicationName),
max: getField(node, n.maxFieldType, n.max),
idleTimeoutMillis: getField(node, n.idleFieldType, n.idle),
connectionTimeoutMillis: getField(node, n.connectionTimeoutFieldType, n.connectionTimeout),
});
this.pgPool.on('error', (err, _) => {
node.dbAccessData = getDbAccessData(node);

node.pgPool = new Pool(node.dbAccessData);

node.pgPool.on('error', (err, _) => {
node.error(err.message);
});
}
Expand All @@ -105,6 +151,7 @@ module.exports = function (RED) {
node.config = RED.nodes.getNode(config.postgreSQLConfig) || {
pgPool: {
totalCount: 0,
end: null
},
};

Expand Down Expand Up @@ -155,6 +202,28 @@ module.exports = function (RED) {
updateStatus(0, false);

node.on('input', async (msg, send, done) => {

// Scan watchList array, check for parameter changes
let changed = false;
let newParam = undefined;
for (const key of node.config.watchList) {
const param = node.config.dbAccessData[key];
newParam = getParam(node.config, key);
if (newParam !== param) {
node.config.dbAccessData[key] = newParam;
changed = true;
};
};

// Reset connections pool, if needed
if (changed || msg.reconnect) {
if (node.config.pgPool.end !== null) {
node.config.pgPool.end();
}
node.config.dbAccessData = getDbAccessData(node.config);
node.config.pgPool = new Pool(node.config.dbAccessData);
}

// 'send' and 'done' require Node-RED 1.0+
send = send || function () { node.send.apply(node, arguments); };

Expand Down